Duplicati using rclone backend (using a recent rclone beta) might be a workaround for the API change.
JottaCloud migration to Drive (rclone remark)
The Jottacloud remote is using the Jottacloud-API unofficially .
Slow Download speed with Jottacloud in case of recovery #3248 (Duplicati remark from @albertony)
Jottacloud seem to be moving to a newer API in their own clients.
Although workarounds seem to be underway, this may ideally call for code change to track the new API.
Can’t create or mount jottacloud remote. #3434 was the rclone issue, and it looks like how to release the fixed version is a question. Duplicati has been trying to get a beta too. If a fix is done, maybe it will ship…
Getting beta release out has been hard lately. The upcoming one is stalled on “FTP (Alternative)” update. Meanwhile other good fixes are accumulating, along with some others that might need more test or time.